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"Tratado da sphera" is a translation of Joannes de Sacro Bosco's Sphaera mundi; "Theorica Do Sol E Da Lua" is a translation of the first two parts of Georg Aunpekh's Theoricae novae planetarum; "Liuro primeiro da Geographia" is a translation of Ptolemy's first book of his Cosmography Topics: Navigation, Mathematical geography, Astronomy, Imprint 1537